C–2
M-0420 Instruction Book
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Table C-1
Communication Port Signals
C.4 Direct Terminal Communications via
COM1
The M-0420 Multifunction Relay provides a limited
communications ability via the front panel COM1
port. A subset of the status parameters and control
functions may be executed via a standard "dumb"
terminal. This function may be used during testing
or while the unit is on-line. The unit must not be
in local mode while using this function.
Any terminal which supports ANSI emulation
(sometimes called an ANSI BBS terminal) can
be used. Additionally, a compatible PC running
any standard terminal emulator software (such
as Procomm or Smarterm) set to the ANSI terminal
type may be used. Because most terminals and
PCs are also configured as DTE (Data Terminal
Equipment), some form of null modem cable is
usually required. Pin-outs for these cables are
provided in Figures C-1 and C-2. These cables
are available from Beckwith Electric, or can be
fabricated or purchased from most computer supply
houses.
The baud rate and parity settings must match
the settings of the relay. The relay always
communicates with 8 data bits, 1 stop bit, and
either even or no parity.
The commands available in this mode are listed
in Table C-2. They can be issued by pressing
the appropriate key.
■
NOTE: Do not use other keys. They are reserved
for factory use and may result in unpredictable
operation.
Procedure for Terminal Communications via
COM1
1. Set the baud rate and parity in the Configure
COM1 menu of the relay
2. Exit local mode.
3. Connect properly wired cable between the
front panel COM1 port and the terminal or
PC.
4. Set the terminal baud rate, number of bits,
number of stop bits, etc.
5. Press any of the key codes defined in Table
C-2.
*
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Table C-2
Terminal Commands
Содержание M-0420
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